8天学通MongoDB——第八天驱动实践-白红宇

作为系列的最后一篇，得要说说C#驱动对mongodb的操作，目前驱动有两种：官方驱动和samus驱动，不过我个人还是喜欢后者，

因为提供了丰富的linq操作，相当方便。

官方驱动：。下载后，还提供了一个酷似msdn的帮助文档。

samus驱动：。

下面就具体看看samus驱动，上面提供了

一个简单的demo，大体上看看我们就知道怎么玩了。

一：实践

1：我们建立一个Person实体，MongoAlias特性表示取别名，这里的ID值将会覆盖掉数据库自动生成的_id。

#region 数据实体    /// /// 数据实体/// 
    public class Person    {        [MongoAlias("_id")]        public string ID { get; set; }        public string Name { get; set; }        public int Age { get; set; }        public DateTime CreateTime { get; set; }    }    #endregion

2：初始化一些变量

string connectionString = string.Empty;        string databaseName = string.Empty;        string collectionName = string.Empty;        static MongodbHelper
    
      mongodb;        #region 初始化操作/// 
     /// 初始化操作/// 
        public MongodbHelper()        {            connectionString = "Server=127.0.0.1:2222";            databaseName = "shopex";            collectionName = "person";        }        #endregion

3：为了方便T的继承类使用linq功能，我们还需要映射一下。

#region 实现linq查询的映射配置        /// /// 实现linq查询的映射配置/// 
        public MongoConfiguration configuration        {            get            {                var config = new MongoConfigurationBuilder();                config.Mapping(mapping =>                {                    mapping.DefaultProfile(profile =>                    {                        profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));                    });                    mapping.Map
    
     ();                    mapping.Map
     
      ();                });                config.ConnectionString(connectionString);                return config.BuildConfiguration();            }        }        #endregion

4：下面是一些基本的CURD的代码，跟写EF代码很类似，写起来好舒服。

#region 插入操作        /// /// 插入操作/// 
/// /// 
            public void Insert(T t)        {            using (Mongo mongo = new Mongo(configuration))            {                try                {                    mongo.Connect();                    var db = mongo.GetDatabase(databaseName);                    var collection = db.GetCollection
    
     (collectionName);                    collection.Insert(t, true);                    mongo.Disconnect();                }                catch (Exception)                {                    mongo.Disconnect();                    throw;                }            }        }        #endregion        #region 更新操作        /// 
     /// 更新操作/// 
/// 
     /// 
             public void Update(T t, Expression
     
      
       > func)        {            using (Mongo mongo = new Mongo(configuration))            {                try                {                    mongo.Connect();                    var db = mongo.GetDatabase(databaseName);                    var collection = db.GetCollection
       
        (collectionName);                    collection.Update
        
         (t, func, true);                    mongo.Disconnect();                }                catch (Exception)                {                    mongo.Disconnect();                    throw;                }            }        }        #endregion        #region 获取集合        /// 
         ///获取集合/// 
/// 
         /// 
                 public List
         
           List(int pageIndex, int pageSize, Expression
          
           
            > func, out int pageCount) { pageCount = 0; using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
            
             (collectionName); pageCount = Convert.ToInt32(collection.Count()); var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1)) .Take(pageSize).Select(i => i).ToList(); mongo.Disconnect(); return personList; } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion #region 读取单条记录 /// 
             ///读取单条记录/// 
/// 
             /// 
              public T Single(Expression
             
              
               > func) { using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
               
                (collectionName); var single = collection.Linq().FirstOrDefault(func); mongo.Disconnect(); return single; } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion #region 删除操作 /// 
                /// 删除操作/// 
/// 
                /// 
                 public void Delete(Expression
                
                 
                  > func) { using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
                  
                   (collectionName); //这个地方要注意，一定要加上T参数，否则会当作object类型处理//导致删除失败 collection.Remove
                   
                    (func); mongo.Disconnect(); } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion

5. 好，我们开一下2222端口，由于前前篇我已经把这个mongodb做成了服务，现在就直接连过去了，并做一下对Name的索引。

6. 一切准备妥当，我们做下基本的操作，比如这里我添加一千条数据，注意我开启的是安全模式，如果插入不成功，将会抛出异常。

<1> Add:

static void Main(string[] args)        {            MongodbHelper
    
      helper = new MongodbHelper
     
      ();            //插入1000条数据            for (int i = 0; i < 1000; i++)            {                helper.Insert(new Person()                {                    ID = Guid.NewGuid().ToString(),                    Name = "jack" + i,                    Age = i,                    CreateTime = DateTime.Now                });            }            Console.WriteLine("插入成功");            Console.Read();        }

乍一看显示的数据以为有问题，为什么没有出现jack0或者jack999，不过find的一下后心情舒坦了。

<2> update: 这里就把jack941的名字改掉“mary”

static void Main(string[] args)        {            MongodbHelper
    
      helper = new MongodbHelper
     
      ();            //修改jack941改成mary            var single = helper.Single(i => i.Name == "jack941");            single.Name = "mary";            helper.Update(single, i => i.ID == single.ID);            Console.WriteLine("修改成功");            Console.Read();        }

<3>Delete：删除mary这条记录

static void Main(string[] args)        {            MongodbHelper
    
      helper = new MongodbHelper
     
      ();            //删除mary这个记录            helper.Delete(i => i.Name == "mary");            Console.WriteLine("删除成功");            Console.Read();        }

<4> list操作：这里我获取一下名字里面带9的人数列表

static void Main(string[] args)        {            MongodbHelper
    
      helper = new MongodbHelper
     
      ();            int pagecount;            //获取名字里面带9的人数            var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);           Console.Read();        }

总的运行代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Configuration;using System.Linq.Expressions;using MongoDB.Configuration;using MongoDB.Linq;using MongoDB.Attributes;namespace MongoDB.Test{    public class MongodbHelper
    
      where T : class    {        string connectionString = string.Empty;        string databaseName = string.Empty;        string collectionName = string.Empty;        static MongodbHelper
     
       mongodb;        #region 初始化操作        /// 
      /// 初始化操作/// 
        public MongodbHelper()        {            connectionString = "Server=127.0.0.1:2222";            databaseName = "shopex";            collectionName = "person";        }        #endregion        #region 实现linq查询的映射配置        /// 
      /// 实现linq查询的映射配置/// 
        public MongoConfiguration configuration        {            get            {                var config = new MongoConfigurationBuilder();                config.Mapping(mapping =>                {                    mapping.DefaultProfile(profile =>                    {                        profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));                    });                    mapping.Map
      
       ();                    mapping.Map
       
        ();                });                config.ConnectionString(connectionString);                return config.BuildConfiguration();            }        }        #endregion        #region 插入操作        /// 
        /// 插入操作/// 
/// 
        /// 
                public void Insert(T t)        {            using (Mongo mongo = new Mongo(configuration))            {                try                {                    mongo.Connect();                    var db = mongo.GetDatabase(databaseName);                    var collection = db.GetCollection
        
         (collectionName);                    collection.Insert(t, true);                    mongo.Disconnect();                }                catch (Exception)                {                    mongo.Disconnect();                    throw;                }            }        }        #endregion        #region 更新操作        /// 
         /// 更新操作/// 
/// 
         /// 
                 public void Update(T t, Expression
         
          
           > func) { using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
           
            (collectionName); collection.Update
            
             (t, func, true); mongo.Disconnect(); } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion #region 获取集合 /// 
             ///获取集合/// 
/// 
             /// 
              public List
             
               List(int pageIndex, int pageSize, Expression
              
               
                > func, out int pageCount) { pageCount = 0; using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
                
                 (collectionName); pageCount = Convert.ToInt32(collection.Count()); var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1)) .Take(pageSize).Select(i => i).ToList(); mongo.Disconnect(); return personList; } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion #region 读取单条记录 /// 
                 ///读取单条记录/// 
/// 
                 /// 
                  public T Single(Expression
                 
                  
                   > func) { using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
                   
                    (collectionName); var single = collection.Linq().FirstOrDefault(func); mongo.Disconnect(); return single; } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion #region 删除操作 /// 
                    /// 删除操作/// 
/// 
                    /// 
                     public void Delete(Expression
                    
                     
                      > func) { using (Mongo mongo = new Mongo(configuration)) { try { mongo.Connect(); var db = mongo.GetDatabase(databaseName); var collection = db.GetCollection
                      
                       (collectionName); //这个地方要注意，一定要加上T参数，否则会当作object类型处理//导致删除失败 collection.Remove
                       
                        (func); mongo.Disconnect(); } catch (Exception) { mongo.Disconnect(); throw; } } } #endregion } #region 数据实体 /// 
                        /// 数据实体/// 
 public class Person { [MongoAlias("_id")] public string ID { get; set; } public string Name { get; set; } public int Age { get; set; } public DateTime CreateTime { get; set; } } #endregion}